The website description of this bottle as "Made with 100% 304 food-grade stainless steel," is not true. The bottle is not 100% steel - there is a disk of something that may be either plastic or silicone in the lid which is presumably there to provide the seal.
I would not have bought the bottle if I had known it was there, as I wanted a 100% steel bottle, which is what it was claimed to be. Although the bottle is well-made, the website misrepresents the product.
On the positive side, I'm very pleased with the order process and the speed of posting the bottle. The bottle itself is sturdy, the lid fits well and the loop handle is useful for opening/closing the lid as it allows you to give extra torque ensuring a good tightness.
The company should update the description so it's accurate.